Irreversible gearing.



E. G. JOHANSON.

IRREVERSIBLE GE'ARING.

APPUCATION man ocT.25. 191a.

Patented July 2, 1918..

Wae55e6 @et I b l Ell/[IL GOTTFRIED JOHANSON, 0F ROCKFORD, ILLINOIELIRRE'VERSIBLE GEARIN G.

Application filed October 25, 1913.

To all whom it may concern:

Be it known that I, EMIL Gor'rrnino Jo- HANSON, of Rockford, in thecounty of Winnebago and State of Illinois, have invented certain new anduseful Improvements in Irreversible Gearing, of which the following is aspecification.

My present invention relates in general to gearing, and moreparticularly to irreversible gearing, and has special reference to theprovision of an improved form of irreversible speed changing gearing.

The principal objects of my present in vention are the provision of animproved power transmission gearing, and more particularly a gearingwherein the primary driven element is moved at a rate of speed differentfrom the driving element, characterized by the fact that the ultimatedriving clement, while it moves freely either clock wise orcontraclockwise according to the motion imparted to it through theprimarily driven element, nevertheless, in turn, is so disposed as to beincapable of transmitting motion to the said primary driven element; theprovision of an improved structure of the class referred to which may beeasily and inexpensively constructed but which, however, may be operatedand maintained at a lowv cost and is not apt to become out of order.

While gearing of the present type has a wide field of usefulness, I findit peculiarly adapted for the delivery of power for the operation ofpassenger and freight elevators, where it is highly desirable that inthe event of any failure of the motive power which drives the gearing,such gearing will not run loosely and allow the elevator car to descendrapidly, or fall as it is said, with consequent danger to life andproperty.

I have therefore in the present instance as a matter of conveniencedisclosed my improvements in a form applicable for elevator service, andin the accompanying drawing have illustrated a preferred type ofconstruction employed by me for such purpose.

In the drawing- Figure 1 is an elevational view of an elevator drivingmechanism embodying my present improvements;

Fig. 2 is a face view of speed changing gearing, the casing of which isindicated at Specification of Letters Patent.

Patented July 2, 121.2.

Serial No. 797244;.

2 in Fig. 1, regarding it from the aspect indicated by the arrow in suchfigure; and

Fig. 3 is a central sectional view of the gearing.

Referring first to Fig. 1 of the drawing it will be observed that I havehere illus trated in a somewhat diagrammatic form an embodiment ofmyinvention which is, as above stated, applicable for driving elevatorcars, wherein I employ an electric niotor, 1, current for driving whichis derived from any convenient source of supply (not shown), the outerend of the armature shaft 3 of said motor being supported by a standard4 and provided with a pinion 5 for driving a chain 6 which in turndrives the pinion 7 of the speed changing gearing at one side of thecasing or housing 2 thereof, the opposite side of said gearing beingprovided with a sprocket 8 which drives a chain 9 engaging a sprocket 10on the overhead sheave shaft 11 which carries the main sheave (notshown) customarily employed for supporting the cables of the elevatorcar.

Referring now more particularly to Figs. 2 and 3, it will be observedthat the main casing or fixed gear member 2 is provided with an annularflange 12 having a dependent portion 14 secured thereto in a suitablemanner such as bolts 15, said member 14 be- 111g provided on its innerperiphery with a number of gear teeth 16. Within the casing 2 andpreferably concentrically with portion 14, is revolubly mounted. asecond gear member 17 having a projecting annular flange 18 provided onits inner periphery with teeth 19, and within the casing is furthermounted a third gear member, preferably a disk 20 having teeth 21meshing with said teeth 16 and 19, said member 20 being preferably ofmaterially less perimeter than the said portions 14 and 18. Ihe member17 has provided thereon a hub 22 which extends through the casing 2 andcarries at the extremity of such hub, as an ultimate driving element, asprocket 8, non-rotatably mounted thereon, a collar 23 being employed tospace said sprocket 8 away from the casing 2, and a collar 24 held inposition by a set screw 25 bearing on the shaft 26 being utilized forholding said sprocket 8 in position on said hub 22 for rotationtherewith. The shaft 26 has an eccentric or crank portion will 27centrally engaging the gear 20, and a priinarily driven memberthe pinion7-is carried at the extremity of said crank shaft 26 but spaced awayfrom the gear 20 by a collar 28 held in-position bya set screw 29,bearing on the shaft 26. As will be clearly seen from examination ofFig. 2 of the drawing, the member 14 has teeth, 16, one more or less innumber than the teeth, 19, on the member 18 for the purpose now to bedescribed.

In the operation of the device it will be apparent than on motion beingtransmitted to the pinion 7 by means of the'chain 6, the shaft 26 willalso be rotated through the eccentric or crank 27, thereby causing freerotation of the gear'2O in an opposite direction, and owing to the factthat the teeth 21 of said gear 20 mesh with the teeth '16 of-the annularmember 14, the member 17 is r0- tated in a direction opposite to thepinion 7, and the sprocket 8 moves concentrically with said gear 17.

I vAs will be clear from the drawing, (Fig. 2) the pinion 7 moves freelyeither clockwise or contraclookwise, but owing to the locking of thegears 16 and 19 by means of the gear '20, when power is applied tothesprooket 8, as by the weight of the elevator car, no motion istransmitted and the mechanism remains stationary, since neither the gear20 nor the pinion 7 or any other of the parts of the mechanism aremovable by means of the sprocket 8.

The form of gearing here shown gives a reduction of about 33 to 1, butobviously a large range of reduction ratio may be attained by varyingthe proportion of the gear 20 to the gears 1e and 18.

Having thus described my invention and I of teeth being of a diameterwhich is less than the diameter of the member having the larger numberof teeth, and a driving pinion located eccentrically within said gearsand in mesh therewith, said pinion having portions of differentdiameters to conform to the difi'erence in the diameters of the internalgears.

In testimony whereof I have hereunto signed my name in the presence ofthe two subscribed witnesses.

EMIL GOTTFRIED JOHANSON.

Vitnesses MARTHA WESTMAN, PAUL CARPENTER.

DQ013165 of thispatent may :be obtained for five cents each, byaddressing the Commissioner of Patents, "Washington, D. G.

